Hi,
I use
www.backblaze.com, of all the cloud based solutions this is the absolute winner, it is fully automatic for Mac and Windows.
I recommend it to friends and family cause I did my homework and I know this is the most reputable cloud based backup solution. My Parents and InLaws use it and they're happy cause there is no setup and no configuration.
So there, that's the easiest, use this recommend link and you'll get a month free:
https://secure.backblaze.com/r/00s7b0
Good luck!